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DHCP Lease Allocation Process
(Page 3 of 3)
Dealing With Lost Messages or Failure of the Allocation Process
You can see in this description that
there are a number of situations that may occur that require a client
to retransmit messages. This is because DHCP
uses UDP which is unreliable and can cause
messages to be lost. If retransmissions don't fix a problem such as
not receiving a DHCPOFFER or a DHCPACK from a server,
the client may have to start the allocation process over from scratch.
The client must include enough intelligence to prevent it
from simply trying forever to get a lease when there may not be a pointfor
example, if there are no DHCP servers on the network, no number of retransmissions
Thus, after a number of retries the
client will give up and the allocation process will fail. If the client
is configured to use the Automatic
Private IP Addressing feature, this is
where it would be used to give the client a default address. Otherwise,
the client will be, well, dead in the water.
Key Concept: The most important configuration process in DHCP is the lease allocation process, used by clients to acquire a lease. The client broadcasts a request to determine if any DHCP servers can hear it. Each DHCP server that is willing to grant the client a lease sends it an offer. The client selects the lease it prefers and sends a response to all servers telling them its choice. The selected server then sends the client its lease information.
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
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